138613910 has 32 divisors (see below), whose sum is σ = 258940800. Its totient is φ = 53361280.

The previous prime is 138613889. The next prime is 138613919. The reversal of 138613910 is 19316831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138613919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124436 + ... + 125544.

It is an arithmetic number, because the mean of its divisors is an integer number (8091900).

Almost surely, 2^138613910 is an apocalyptic number.

138613910 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138613910 is a deficient number, since it is larger than the sum of its proper divisors (120326890).

138613910 is a wasteful number, since it uses less digits than its factorization.

138613910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1576.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 138613910 is about 11773.4408734235. The cubic root of 138613910 is about 517.5300891900.

It can be divided in two parts, 13861 and 3910, that added together give a palindrome (17771).

The spelling of 138613910 in words is "one hundred thirty-eight million, six hundred thirteen thousand, nine hundred ten".